Method of producing films or the like, particularly for use in electric condensers



film is formed by two or more films which Patented Aug. 23, 1932 IUNITED stares PATENT OFFICE mun PFIFENER, or museum, swrrznamn,assreuon, BY unsnn assreimnurs, 'ro

RADIO PATENTS CORPORATION; OF NEW YORK, N. Y.,

A CORPORATION OF NEW YORK manner or rnonucme runs on man 1.11m,rsarrcunanmr non use m nLnc'rnIc connnnsnns No Drawing. Applicationfiled February 10, 1927,.861'181 H0. 187,371,

; ture, as otherwise the dielectric. is punctured in case of any damagedor flawed place.

However in practice it has been found, that such deficient places in thefilm.cannot be avoided even if the greatest care is taken during themanufacture, because all impurities cannot be removed even in the caseof the most careful filtering. 1 I

According to the present invention the are united to a homo eneous filmbefore the same become stifi. y employin suitable and properly mixedsolvents an swelling means for the different cellulose mixtures it ispossible to produce films of any desired thickness and to regulatethetime of stifiening according to re composite film, consisting of anumber of films, may be made of the desired thickness. For efiecting aproper overlapping of weak spots in one of homogeneous composite film itis necessary,

that in the moment of union each individual ployed and film has to' beof sufiicient consistenc m order to render impossible an exchange 0 theim urities contained in the individual films.

ucha film is more resistant. against puncturing, electricall other.

The com as the sin le films. with the exception that a number 0 s rayingarrangements are em at the individual films meet: on

.a common support at such'a plasticity, that they unitewith one anotherwithout forming blisters and. form a film of a homogeneous structure,which in the dry condition\ does not show any stratas.

If desired the homogeneity operation may the individual 'films of theposite film according to the present.

and in Germany larch a2, 1920.

as support during the manufacture of the film. The convenient proportionof the solvents and swelling means is determined by a simple test.

I claim;- The method of forming dielectric coated condenser plates whichcomprises forming a plurality of cellulose derivative films in asomewhat plastic condition, attachin one of said films to acondenser-plate, an homo geneously uniting the films to each other withthe aid of pressure while still in a plastic condition. g

In testimony whereof I afiix no signature.

, EMIL PF FFNER.

guirement, so that the because it is not very likel that deficientplaces of the di erent' 'individua films just coincide with one anbepromoted by heat and pressure "and the metal sheet,- forming theconductor, may serve

